特定のマイルストーンのIssueの一覧を取得する ref: http://qiita.com/eielh/items/6890b18974180deb5c61

file0.rb

require 'octokit'

def issues_filter_milestone(repo, name)
  number = Octokit.list_milestones(repo).select do |milestone|
    milestone.title == name
  end.first.number
  Octokit.list_issues(repo, milestone: number)
end

issues_filter_milestone("great-h/great-h.github.io","20141224")

file1.rb

Octokit.list_issues(repo, milestone: number)